Astrophys. J., 822, 43-43 (2016/May-1)
Broad [C II] line wings as tracer of molecular and multi-phase outflows in infrared bright galaxies.
JANSSEN A.W., CHRISTOPHER N., STURM E., VEILLEUX S., CONTURSI A., GONZALEZ-ALFONSO E., FISCHER J., DAVIES R., VERMA A., GRACIA-CARPIO J., GENZEL R., LUTZ D., STERNBERG A., TACCONI L., BURTSCHER L. and POGLITSCH A.
Abstract (from CDS):
We report a tentative correlation between the outflow characteristics derived from OH absorption at 119 µm and [C ii] emission at 158 µm in a sample of 22 local and bright ultraluminous infrared galaxies (ULIRGs). For this sample, we investigate whether [C ii] broad wings are a good tracer of molecular outflows, and how the two tracers are connected. Fourteen objects in our sample have a broad wing component as traced by [C ii], and all of these also show OH119 absorption indicative of an outflow (in one case an inflow). The other eight cases, where no broad [C ii] component was found, are predominantly objects with no OH outflow or a low-velocity (<=100 km s-1) OH outflow. The FWHM of the broad [C ii] component shows a trend with the OH119 blueshifted velocity, although with significant scatter. Moreover, and despite large uncertainties, the outflow masses derived from OH and broad [C ii] show a 1:1 relation. The main conclusion is therefore that broad [C ii] wings can be used to trace molecular outflows. This may be particularly relevant at high redshift, where the usual tracers of molecular gas (like low-J CO lines) become hard to observe. Additionally, observations of blueshifted Na i D λλ 5890, 5896 absorption are available for 10 of our sources. Outflow velocities of Na i D show a trend with OH velocity and broad [C ii] FWHM. These observations suggest that the atomic and molecular gas phases of the outflow are connected.
© 2016. The American Astronomical Society. All rights reserved.
galaxies: active - galaxies: evolution - galaxies: starburst - ISM: jets and outflows
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